TWI852391B - Pd controller ic - Google Patents

Abstract

A PD controller integrated circuit of a USB apparatus is provided, including a CC pad, a first switch, a second switch, a PD controller circuit, a high voltage sensing circuit and a switch control circuit. The high voltage sensing circuit senses the CC pad. When a current voltage of the CC pad does not exceed a rated range, the first switch and the second switch connected in series between the CC pad and the PD controller circuit are turned on. When the current voltage exceeds the rated range, the first switch and the second switch are turned off, and the switch control circuit maintains the voltage of a common node between the first switch and the second switch at a reduced level lower than the current voltage.

Description

PD controller integrated circuit

The present invention relates to an integrated circuit, and in particular to a power delivery (PD) controller integrated circuit of a universal serial bus (USB) circuit.

Generally speaking, users use chargers or adapters to power electronic products, such as desk lamps, speakers, or other electronic products. The connection interface between the charger and the electronic product is generally a connector that complies with standard specifications. For example, the connection interface between the charger and the electronic product may include a USB type-A connector or a USB type-C connector that complies with the Universal Serial Bus (USB) specification. Hosts such as computers can also power electronic products through USB connectors.

When a USB host (or USB charger, or USB adapter) is connected to the USB connector of an electronic product, the Power Delivery (PD) controller of the electronic product can exchange configuration information with the USB host via the Configuration Channel (CC) pin of the USB connector to negotiate the power delivery mode between the USB host and the electronic product. The related operations of PD control and CC pins are specified in the USB specification, so they will not be elaborated here. After determining the power delivery mode, the PD controller can turn on the power switch connected to the power pin (Vbus pin) of the USB connector and the power input end of the functional circuit. After the power switch is turned on, the USB host can supply power to the functional circuit of the electronic product through the USB connector and the power switch.

Generally speaking, the voltage of the power pin Vbus of the USB connector is much higher than the voltage of the CC pin. In the USB connector, the CC pin is adjacent to the power pin Vbus. In some unexpected situations, the CC pin and the power pin Vbus may be short-circuited to each other, causing the high voltage of the power pin Vbus to pass through the CC pin and burn out the PD controller. How to prevent the accidental high voltage (high voltage beyond the rated range) of the CC pin from burning out the PD controller is one of the many technical issues in this field.

It should be noted that the contents of the "Prior Art" section are used to help understand the present invention. Some (or all) of the contents disclosed in the "Prior Art" section may not be the common knowledge known to those with ordinary knowledge in the relevant technical field. The contents disclosed in the "Prior Art" section do not mean that the contents have been known to those with ordinary knowledge in the relevant technical field before the present invention is applied.

The present invention provides a power delivery (PD) controller integrated circuit to prevent the impact of unexpected high voltage (high voltage beyond the rated range) from the configuration channel (CC) pin of the universal serial bus (USB) connector.

In one embodiment of the present invention, the above-mentioned PD controller integrated circuit includes a CC pad, a first switch, a second switch, a PD controller circuit, a high-voltage sensing circuit and a switch control circuit. The CC pad is used to couple to the CC pin of the USB connector. The first end of the first switch is coupled to the CC pad. The first end of the second switch is coupled to the second end of the first switch. The PD controller circuit is coupled to the second end of the second switch. The high-voltage sensing circuit is coupled to the CC pad. The high-voltage sensing circuit is used to sense whether the current voltage of the CC pad exceeds the rated range and output the corresponding sensing result. The switch control circuit is coupled to the high-voltage sensing circuit to receive the sensing result. The switch control circuit is coupled to the control end of the first switch, the second end of the first switch, the first end of the second switch and the control end of the second switch. When the sensing result indicates that the current voltage of the CC pad does not exceed the rated range, the switch control circuit turns on the first switch and the second switch, so that the PD controller circuit is coupled to the CC pin of the USB connector through the CC pad. When the sensing result indicates that the current voltage of the CC pad exceeds the rated range, the switch control circuit turns off the first switch and the second switch, and the switch control circuit maintains the voltage of the second end of the first switch and the voltage of the first end of the second switch at a first reduced voltage level. The first reduced voltage level is between the voltage level of the first end of the first switch that is turned off and the voltage level of the second end of the second switch that is turned off.

Based on the above, the PD controller integrated circuit described in various embodiments of the present invention configures the first switch and the second switch between the CC pad and the PD controller circuit. When the voltage of the CC pin of the USB connector connected to the CC pad does not exceed the rated range, the first switch and the second switch are turned on, so that the PD controller circuit can exchange configuration information with the USB host through the second switch, the first switch, the CC pad and the CC pin of the USB connector. When the CC pin voltage exceeds the rated range, the first switch and the second switch are cut off. Therefore, the first switch and the second switch can prevent the unexpected high voltage (high voltage exceeding the rated range) from the CC pin of the USB connector from impacting/burning the PD controller circuit. In addition, when the first switch and the second switch are cut off, even if an unexpected high voltage appears on the CC pad, the switch control circuit can ensure that the voltage difference between the first end voltage of the first switch and the second end voltage of the first switch is less than the unexpected high voltage, and ensure that the voltage difference between the first end voltage of the second switch and the second end voltage of the second switch is less than the unexpected high voltage. Therefore, the first switch and the second switch (PD controller integrated circuit) can be implemented with a general process with a lower withstand voltage, without an expensive high voltage process.

In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below and described in detail with reference to the accompanying drawings.

The term "coupled (or connected)" used in the entire specification of this case (including the scope of the patent application) may refer to any direct or indirect means of connection. For example, if the text describes that a first device is coupled (or connected) to a second device, it should be interpreted that the first device can be directly connected to the second device, or the first device can be indirectly connected to the second device through other devices or some connection means. The terms "first", "second", etc. mentioned in the entire specification of this case (including the scope of the patent application) are used to name the elements or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements, nor to limit the order of elements. In addition, wherever possible, elements/components/steps with the same number in the drawings and embodiments represent the same or similar parts. Elements/components/steps using the same reference numerals or the same terms in different embodiments may refer to each other for related descriptions.

FIG1 is a circuit block diagram of an electronic product 100 according to an embodiment of the present invention. The electronic product 100 shown in FIG1 includes a Universal Serial Bus (USB) connector 110, a Power Delivery (PD) controller integrated circuit 120, a functional circuit 130, and a power switch SWbus. As an example, the USB connector 110 may include a USB type-C connector. The first end of the power switch SWbus is coupled to the power pin Vbus of the USB connector 110. The second end of the power switch SWbus is coupled to the power input end of the functional circuit 130. The control end of the power switch SWbus is coupled to the PD controller integrated circuit 120 to receive the power switch control voltage SW_EN. The PD controller integrated circuit 120 can generate a power switch control voltage SW_EN to control the power switch SWbus.

The PD controller integrated circuit 120 is also coupled to the Configuration Channel (CC) pin of the USB connector 110. When a USB host (or USB charger, or USB adapter, not shown in FIG. 1 ) is connected to the USB connector 110 of the electronic product 100, the PD controller integrated circuit 120 can exchange configuration information with the USB host via the CC pin of the USB connector 110 to negotiate the power transmission mode between the USB host and the electronic product 100. The relevant operations of the CC pin are specified in the USB specification and are not described here. After determining the power transmission mode, the PD controller integrated circuit 120 can turn on the power switch SWbus, and the USB host can provide the negotiated power to the functional circuit 130 through the power pin Vbus and the power switch SWbus.

Generally speaking, the voltage of the power pin Vbus is much greater than the rated range of the voltage of the CC pin. In the USB connector 110, the CC pin is adjacent to the power pin Vbus. In some unexpected situations, the CC pin and the power pin Vbus may be short-circuited to each other, causing the high voltage of the power pin Vbus to pass through the CC pin and impact the internal circuit of the PD controller integrated circuit 120. The following embodiment will illustrate how the PD controller integrated circuit 120 prevents the unexpected high voltage (high voltage beyond the rated range) of the CC pin of the USB connector 110 from burning the internal circuit.

FIG2 is a circuit block diagram of a PD controller integrated circuit 120 according to an embodiment of the present invention. The PD controller integrated circuit 120 shown in FIG2 can be one of many implementation examples of the PD controller integrated circuit 120 shown in FIG1 . In the embodiment shown in FIG2 , the PD controller integrated circuit 120 includes a configuration channel (CC) pad PADcc, a switch SW21, a switch SW22, a PD controller circuit 121, a high voltage sensing circuit 122, and a switch control circuit 123. According to different designs, in some embodiments, the PD controller circuit 121 can be implemented as a hardware circuit. In other embodiments, the PD controller circuit 121 can be implemented as firmware, software (i.e., program), or a combination of the two. In some other embodiments, the PD controller circuit 121 may be implemented as a combination of hardware, firmware, and software.

In terms of hardware, the PD controller circuit 121 can be implemented as a logic circuit on an integrated circuit. For example, the relevant functions of the PD controller circuit 121 can be implemented in various logic blocks, modules and circuits in one or more controllers, microcontrollers, microprocessors, application-specific integrated circuits (ASICs), digital signal processors (DSPs), field programmable gate arrays (FPGAs) and/or other processing units. The relevant functions of the PD controller circuit 121 can be implemented as hardware circuits, such as various logic blocks, modules and circuits in an integrated circuit, using hardware description languages (such as Verilog HDL or VHDL) or other suitable programming languages.

In software form and/or firmware form, the relevant functions of the above-mentioned PD controller circuit 121 can be implemented as programming codes. For example, the PD controller circuit 121 is implemented using general programming languages (such as C, C++ or assembly language) or other suitable programming languages. The programming code can be recorded/stored in a "non-transitory computer readable medium". In some embodiments, the non-transitory computer readable medium includes, for example, a semiconductor memory and/or a storage device. The semiconductor memory includes a memory card, a read-only memory (ROM), a flash memory (FLASH memory), a programmable logic circuit or other semiconductor memory. The storage device includes a tape, a disk, a hard disk drive (HDD), a solid-state drive (SSD) or other storage devices. An electronic device (such as a central processing unit (CPU), a controller, a microcontroller or a microprocessor) can read and execute the programming code from the non-temporary computer-readable medium to implement the relevant functions of the PD controller circuit 121.

The CC pad PADcc is used to couple to the CC pin of the USB connector 110. The first end of the switch SW21 is coupled to the CC pad PADcc. The first end of the switch SW22 is coupled to the second end of the switch SW21. The PD controller circuit 121 is coupled to the second end of the switch SW22. The high-voltage sensing circuit 122 is coupled to the CC pad PADcc. The high-voltage sensing circuit 122 can sense whether the current voltage of the CC pad PADcc exceeds the rated range of the CC pin and output the sensing result to the switch control circuit 123 accordingly. The rated range of the CC pin is specified in the USB specification, so it will not be elaborated here. The switch control circuit 123 is coupled to the high-voltage sensing circuit 122 to receive the sensing result. The switch control circuit 123 is also coupled to the control end of the switch SW21, the second end of the switch SW21, the first end of the switch SW22, and the control end of the switch SW22, as shown in FIG. 2 .

When the sensing result of the high voltage sensing circuit 122 indicates that "the current voltage of the CC pad PADcc does not exceed the rated range", the switch control circuit 123 turns on the switch SW21 and the switch SW22, so that the PD controller circuit 121 can be coupled to the CC pin of the USB connector 110 through the CC pad PADcc. Therefore, when the voltage of the CC pin of the USB connector 110 does not exceed the rated range, the PD controller circuit 121 can exchange configuration information with the USB host (not shown in FIG. 2 ) through the switch SW22, the switch SW21, the CC pad PADcc and the CC pin of the USB connector 110 to negotiate the power transmission mode between the USB host and the electronic product 100.

When the sensing result of the high voltage sensing circuit 122 indicates that the current voltage of the CC pad PADcc exceeds the rated range, the switch control circuit 123 can immediately turn off the switches SW21 and SW22. Therefore, the switches SW21 and SW22 can prevent the unexpected high voltage (high voltage exceeding the rated range) from the CC pin of the USB connector 110 from impacting/burning the PD controller circuit 121.

In addition, when the switch SW21 and the switch SW22 are turned off, even if an unexpected high voltage appears on the CC pad PADcc, the switch control circuit 123 can maintain the voltage of the second end of the switch SW21 and the voltage of the first end of the switch SW22 at a reduced voltage level. The reduced voltage level is between the voltage level of the first end of the turned-off switch SW21 and the voltage level of the second end of the turned-off switch SW22. The switch control circuit 123 can ensure that the voltage difference VSD21 between the voltage of the first end of the switch SW21 and the voltage of the second end of the switch SW21 is less than the unexpected high voltage, and ensure that the voltage difference VSD22 between the voltage of the first end of the switch SW22 and the voltage of the second end of the switch SW22 is less than the unexpected high voltage. Therefore, the switches SW21 and SW22 (PD controller integrated circuit 120) can be implemented using a general process with a lower withstand voltage instead of an expensive high voltage process. In the case where the current voltage of the CC pad PADcc exceeds the rated range, the maximum withstand voltage of each of the switches SW21 and SW22 can be less than the current voltage of the CC pad PADcc.

FIG3 is a circuit block diagram of a high voltage sensing circuit 122 according to an embodiment of the present invention. The high voltage sensing circuit 122 shown in FIG3 can be one of many embodiments of the high voltage sensing circuit 122 shown in FIG2 . In the embodiment shown in FIG3 , the high voltage sensing circuit 122 includes a voltage dividing resistor string RS31. The first end of the voltage dividing resistor string RS31 is coupled to the CC pad PADcc. The second end of the voltage dividing resistor string RS31 is coupled to a reference voltage (e.g., a ground voltage GND or other fixed voltage). The voltage dividing resistor string RS31 can generate a voltage dividing voltage as the sensing result to the switch control circuit 123. Therefore, the switch control circuit 123 can determine whether the current voltage of the CC pad PADcc exceeds the rated range of the CC pin according to the divided voltage of the divided resistor string RS31. The CC pad PADcc, the high voltage sensing circuit 122, and the switch control circuit 123 shown in FIG3 can refer to the relevant description of the CC pad PADcc, the high voltage sensing circuit 122, and the switch control circuit 123 shown in FIG2, so it will not be repeated.

FIG4 is a circuit block diagram of a high voltage sensing circuit 122 and a switch control circuit 123 according to an embodiment of the present invention. The high voltage sensing circuit 122 and the switch control circuit 123 shown in FIG4 can be used as one of many embodiments of the high voltage sensing circuit 122 and the switch control circuit 123 shown in FIG2 . In the embodiment shown in FIG4 , the high voltage sensing circuit 122 includes a resistor R43, a Zener diode D43, a diode string DS41, and a resistor R44. The first end of the resistor R43 is coupled to the CC pad PADcc. The cathode of the Zener diode D43 is coupled to the second end of the resistor R43. The anode of the Zener diode D43 is coupled to the switch control circuit 123 to provide a sensing result. The anode of the diode string DS41 is coupled to the anode of the Zener diode D43. The first end of the resistor R44 is coupled to the cathode of the diode string DS41. The second end of the resistor R44 is coupled to a reference voltage (eg, ground voltage GND or other fixed voltage).

When the current voltage of the CC pad PADcc does not exceed the rated range, the Zener diode D43 is cut off, so the resistor R44 pulls down the anode voltage of the Zener diode D43 (the sensing result of the high voltage sensing circuit 122) through the diode string DS41. When the current voltage of the CC pad PADcc exceeds the rated range, the Zener diode D43 breaks down and conducts. At this time, the resistor R43, the Zener diode D43, the diode string DS41 and the resistor R44 can divide the current voltage of the CC pad PADcc and generate a high voltage (the sensing result of the high voltage sensing circuit 122) to the switch control circuit 123.

In the embodiment shown in FIG. 4 , the switch control circuit 123 includes a resistor R41, a resistor R42, a diode D41, a diode D42, a switch SW41, a switch SW42, and a bias voltage generating circuit VG41. The first end of the resistor R41 is coupled to the CC pad PADcc. The second end of the resistor R41 is coupled to the second end of the switch SW21 and the first end of the switch SW22. The anode of the diode D41 is coupled to the second end of the switch SW21 and the first end of the switch SW22. The cathode of the diode D41 is coupled to the control end of the switch SW21. The first end of the resistor R42 is coupled to the cathode of the diode D41 and the control end of the switch SW21. The first end of the switch SW41 is coupled to the second end of the resistor R42. The second end of the switch SW41 is coupled to a reference voltage (eg, a ground voltage GND or other fixed voltage). The control end of the switch SW41 is coupled to the high voltage sensing circuit 122 to receive a sensing result (eg, an anode voltage of the Zener diode D43).

The anode of the diode D42 is coupled to the control end of the switch SW22. The cathode of the diode D42 is coupled to the control end of the switch SW21 and the first end of the resistor R42. The first end of the switch SW42 is coupled to the control end of the switch SW22. The second end of the switch SW42 is coupled to a reference voltage (e.g., a ground voltage GND or other fixed voltage). The control end of the switch SW42 is coupled to the high voltage sensing circuit 122 to receive the sensing result (e.g., the anode voltage of the Zener diode D43). The bias voltage generating circuit VG41 is coupled to the control end of the switch SW22 and the anode of the diode D42 to provide a bias voltage. Based on actual design, in some embodiments, the bias voltage generating circuit VG41 may include a charge pump circuit and/or other voltage generating circuits.

When the sensing result of the high voltage sensing circuit 122 (e.g., the anode voltage of the Zener diode D43) indicates that "the current voltage of the CC pad PADcc does not exceed the rated range", the high voltage sensing circuit 122 can turn off the switch SW41 and the switch SW42. The bias voltage provided by the bias voltage generating circuit VG41 can be transmitted to the control end of the switch SW22, so the switch SW22 is turned on. The bias voltage provided by the bias voltage generating circuit VG41 can also be transmitted to the control end of the switch SW21 through the diode D42, so the switch SW21 is turned on.

When the sensing result of the high voltage sensing circuit 122 (e.g., the anode voltage of the Zener diode D43) indicates that "the current voltage of the CC pad PADcc exceeds the rated range", the high voltage sensing circuit 122 can turn on the switch SW41 and the switch SW42, and the bias voltage generating circuit VG41 stops providing the bias voltage. At this time, the reference voltage (e.g., the ground voltage GND or other fixed voltage) passes through the switch SW42, so the switch SW22 is turned off. The resistor R41, the diode D41, and the resistor R42 divide the current voltage of the CC pad PADcc, and generate a step-down voltage V42 to the control end of the switch SW21 to turn off the switch SW21. The resistor R41, the diode D41, and the resistor R42 divide the current voltage of the CC pad PADcc, and maintain the voltage of the second end of the switch SW21 and the voltage of the first end of the switch SW22 at the stepped-down level V41.

In summary, the PD controller integrated circuit 120 described in the above embodiments configures the switch SW21 and the switch SW22 between the CC pad PADcc and the PD controller circuit 121. When the voltage of the CC pin of the USB connector 110 connected to the CC pad PADcc does not exceed the rated range, the switch SW21 and the switch SW22 are turned on, so that the PD controller circuit 121 can exchange configuration information with the USB host (not shown) through the switch SW22, the switch SW21, the CC pad PADcc and the CC pin of the USB connector 110. When the CC pin voltage exceeds the rated range, the switch SW21 and the switch SW22 are turned off. Therefore, the switches SW21 and SW22 can prevent an unexpected high voltage (a high voltage beyond the rated range) from the CC pin of the USB connector 110 from impacting/burning the PD controller circuit 121. In addition, when the switches SW21 and SW22 are turned off, even if an unexpected high voltage appears on the CC pad PADcc, the switch control circuit 123 can ensure that the voltage difference VSD21 between the first end voltage and the second end voltage of the switch SW21 is less than the unexpected high voltage, and ensure that the voltage difference VSD22 between the first end voltage and the second end voltage of the switch SW22 is less than the unexpected high voltage. Therefore, the switch SW21 and the switch SW22 (PD controller integrated circuit 120) can be implemented using a general process with a lower withstand voltage instead of an expensive high voltage process.

Although the present invention has been disclosed as above by the embodiments, they are not intended to limit the present invention. Any person with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be defined by the scope of the attached patent application.

100: Electronic products 110: Universal Serial Bus (USB) connector 120: Power Delivery (PD) controller integrated circuit 121: PD controller circuit 122: High voltage sensing circuit 123: Switch control circuit 130: Functional circuit D41, D42: Diode D43: Zener diode DS41: Diode string GND: Ground voltage PADcc: Configuration channel (CC) pad R41, R42, R43, R44: Resistors RS31: Voltage divider resistor string SW21, SW22, SW41, SW42: Switch SWbus: Power switch SW_EN: Power switch control voltage Vbus: Power pin VG41: Bias voltage generating circuit VSD21, VSD22: Voltage difference V41, V42: Step-down voltage level

FIG. 1 is a schematic diagram of a circuit block of an electronic product according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a circuit block of a PD controller integrated circuit according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a circuit block of a high-voltage sensing circuit according to an embodiment of the present invention. FIG. 4 is a schematic diagram of a circuit block of a high-voltage sensing circuit and a switch control circuit according to an embodiment of the present invention.

121: PD controller circuit

122: High voltage sensing circuit

123: Switch control circuit

D41, D42: diode

D43: Zener diode

DS41: Diode string

GND: Ground voltage

PADcc: Configuration channel (CC) pad

R41, R42, R43, R44: resistors

SW21, SW22, SW41, SW42: switches

VG41: Bias voltage generating circuit

VSD21, VSD22: voltage difference

V41, V42: voltage reduction level

Claims (6)

A power transmission controller integrated circuit comprises: a configuration channel pad for coupling to a configuration channel pin of a USB connector; a first switch having a first end coupled to the configuration channel pad; a second switch having a first end coupled to a second end of the first switch; a power transmission controller circuit coupled to a second end of the second switch; a high voltage sensing circuit coupled to the configuration channel pad for sensing whether a current voltage of the configuration channel pad exceeds a rated range and outputting a sensing result accordingly; and a switch control circuit coupled to the high voltage sensing circuit to receive the sensing result, and coupled to a control end of the first switch, the second end of the first switch, the first end of the second switch and a control end of the second switch, wherein, When the sensing result indicates that the current voltage of the configuration channel pad does not exceed the rated range, the switch control circuit turns on the first switch and the second switch, so that the power transmission controller circuit is coupled to the configuration channel pin of the USB connector through the configuration channel pad; and When the sensing result indicates that the current voltage of the configuration channel pad exceeds the rated range, the switch control circuit turns off the first switch and the second switch, and the switch control circuit maintains the voltage of the second end of the first switch and the voltage of the first end of the second switch at a first stepped-down level, and the first stepped-down level is between the voltage level of the first end of the first switch that is turned off and the voltage level of the second end of the second switch that is turned off. A power transfer controller integrated circuit as described in claim 1, wherein when the current voltage of the configuration channel pad exceeds the rated range, a maximum withstand voltage of each of the first switch and the second switch is less than the current voltage of the configuration channel pad. A power transmission controller integrated circuit as described in claim 1, wherein the high voltage sensing circuit comprises: A voltage divider resistor string having a first end coupled to the configuration channel pad, wherein a second end of the voltage divider resistor string is coupled to a reference voltage, and the voltage divider resistor string generates a voltage divider as the sensing result. A power transmission controller integrated circuit as described in claim 1, wherein the high voltage sensing circuit comprises: a first resistor having a first end coupled to the configuration channel pad; a Zener diode having a cathode coupled to a second end of the first resistor, wherein an anode of the Zener diode is coupled to the switch control circuit to provide the sensing result; a diode string having an anode coupled to the anode of the Zener diode; and a second resistor having a first end coupled to a cathode of the diode string, wherein a second end of the second resistor is coupled to a reference voltage. A power transmission controller integrated circuit as described in claim 1, wherein the switch control circuit comprises: a first resistor having a first end coupled to the configuration channel pad, wherein a second end of the first resistor is coupled to the second end of the first switch and the first end of the second switch; a first diode having an anode coupled to the second end of the first switch and the first end of the second switch, wherein a cathode of the first diode is coupled to the control end of the first switch; a second resistor having a first end coupled to the cathode of the first diode and the control end of the first switch; A third switch having a first end coupled to a second end of the second resistor, wherein a second end of the third switch is coupled to a first reference voltage, and a control end of the third switch is coupled to the high voltage sensing circuit to receive the sensing result; A second diode having an anode coupled to the control end of the second switch, wherein a cathode of the second diode is coupled to the control end of the first switch and the first end of the second resistor; A bias voltage generating circuit coupled to the control end of the second switch and the anode of the second diode to provide a bias voltage; and A fourth switch having a first end coupled to the control end of the second switch, wherein a second end of the fourth switch is coupled to a second reference voltage, and a control end of the fourth switch is coupled to the high voltage sensing circuit to receive the sensing result. The power transmission controller integrated circuit as described in claim 5, wherein, when the sensing result indicates that the current voltage of the configuration channel pad does not exceed the rated range, the high voltage sensing circuit turns off the third switch and the fourth switch, and the bias voltage provided by the bias voltage generating circuit turns on the first switch and the second switch; and When the sensing result indicates that the current voltage of the configuration channel pad exceeds the rated range, the high voltage sensing circuit turns on the third switch and the fourth switch, the second reference voltage turns off the second switch, the first resistor, the first diode and the second resistor divide the current voltage to generate a second reduced voltage level for the control end of the first switch to turn off the first switch, and the first resistor, the first diode and the second resistor divide the current voltage to maintain the voltage of the second end of the first switch and the voltage of the first end of the second switch at the first reduced voltage level.

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